EP1931166A1 - Rufzulassungssteuerung - Google Patents

Rufzulassungssteuerung Download PDF

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Publication number
EP1931166A1
EP1931166A1 EP07121777A EP07121777A EP1931166A1 EP 1931166 A1 EP1931166 A1 EP 1931166A1 EP 07121777 A EP07121777 A EP 07121777A EP 07121777 A EP07121777 A EP 07121777A EP 1931166 A1 EP1931166 A1 EP 1931166A1
Authority
EP
European Patent Office
Prior art keywords
base station
new user
noise rise
cell
cells
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07121777A
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English (en)
French (fr)
Inventor
Anthony Peter Hulbert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Roke Manor Research Ltd
Original Assignee
Roke Manor Research Ltd
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Filing date
Publication date
Application filed by Roke Manor Research Ltd filed Critical Roke Manor Research Ltd
Publication of EP1931166A1 publication Critical patent/EP1931166A1/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H04W48/06—Access restriction performed under specific conditions based on traffic conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/22—Traffic simulation tools or models

Definitions

  • This invention relates to a method of controlling call admission, in particular for code division multiple access (CDMA) cellular radio networks.
  • CDMA code division multiple access
  • CDMA Code Division Multiple Access
  • the signal to interference ratio is used to control whether a system is overloaded. If power were allowed to increase unchecked, the system would become unstable. There are various ways of determining whether the system is fully loaded.
  • a common method for call admission in CDMA cellular mobile radio networks is based on setting a threshold in the relative noise rise in the base station receivers. This effectively defines the loading in the network on the uplink (mobile to base station communications direction). Conventionally, this involves testing the current noise rise in the base stations. If this exceeds a threshold then new calls are not allowed.
  • the problems with this approach are that it is not clear in how many base stations the noise rise should be tested and for higher bit rate users, especially those near the edge of their cells, admittance could lead to a large further noise rise.
  • the capacity margin will be excessive for the lower bit rate users and/or users closer to the centre of the cell. For these reasons it is preferable to base the call admission policy on a prediction of the noise rise that would occur if the call was allowed. This prediction is a non-trivial problem. Previous attempts at this have been based on considering detailed parameters of all existing calls. The present invention describes an approximate approach based on average assumptions of deployment without the need to know the exact details of the scenario.
  • Predictions for isolated cells can be carried out based on known information about that cell, but once there are multiple cells involved, with pathloss to be taken into account, then the conventional methods are too complex.
  • a method of controlling call admission in a communication system comprises predicting an estimated base station noise rise due to a new user wishing to join a cell of the system; determining availability of resources based on the predicted noise rise due to the new user; and allocating resources only if the predicted noise rise due to the new user does not cause a maximum total permitted noise rise level in the system to be exceeded; wherein a matrix of average geometric cross coupling coefficients between cells is predetermined and stored for each base station, with elements for the base station's immediate neighbours; and wherein the reported measurements of the mobile of the new user, together with the predetermined cross coupling coefficients from the matrix are used to determine whether to admit the new user.
  • the base station noise rise is predicted using current noise rises in base stations in other cells in the system and reported measurements from potential base stations.
  • the base stations in the other cells whose noise rises are used in predicting the base station noise rise in the cell which the new user wishes to make a call are restricted to cells that are neighbours of that cell
  • a mobile device of the new user determines strength of pilots received from potential base stations, determines the base station providing the strongest pilot and reports its measurements to that base station.
  • the reported measurements are used to calculate predicted noise rise in a target cell and a neighbouring cell.
  • the elements of the matrix are determined by means of a geometric or Monte Carlo method, a measurement campaign, or by logging data from actual traffic between base stations in a cell.
  • Fig. 1 shows two adjacent cells 1, 2 with base stations 3, 4 respectively. From a particular mobile device M lm in a particular cell and influenced by another adjacent cell, there is a path gain to each base station 3, 4 i.e. L ljm and L llm .
  • K is not known.
  • the method of the present invention provides a useful approximation to K .
  • the elements of K can be viewed as cross-coupling coefficients between cells. This can be seen geometrically in Fig. 1 .
  • the first term is related to the aggregate bit rate and the second term is an average geometric cross-coupling coefficient.
  • the elements s jl in the analytical model can be obtained by integration, either numerically or by a Monte-Carlo method.
  • a propagation model can be used, which may be in conjunction with a limited automated measurement campaign.
  • S and S -1 can be pre-computed and stored as lookup tables for each base station with elements for its immediate neighbours.
  • the S matrix will be essentially the same, but will have differences according to the number of immediate neighbours (fewer for base stations at the edge of a deployment) and the varying geometries of cells.
  • D is then obtained by dividing the elements of S -1 ( R-N ) by the elements of R and K ⁇ is then formed by multiplication of D by S .
  • K a version of K is obtained that is consistent with the observed noise rises to that point in time.
  • the order of K ⁇ is only the target base station plus its immediate neighbours (typically a maximum of 7), whereas the order of K is the number of base stations in the entire deployment. Therefore, in computing D some artificial weighting will arise, making the effective load in the neighbouring cells appear higher than in reality in order to compensate for the absence of higher tier neighbours in the model.
  • the prediction error for the noise rise in the wanted cell is defined in decibels as 10 ⁇ log 10 R ⁇ j new - R j old R j new - R j old Where j is the index of the affiliated base station R j old is the noise rise before the new mobile is added R j new is the noise rise after the new mobile is added R ⁇ j new is the predicted noise rise
  • Fig. 2 is a graph of probability density against relative prediction error in dB.
  • the mean error in decibels was 0.12 dB and the standard deviation 0.5 dB.
  • These low figures required representative values for the entries in S.
  • the original analysis was performed without shadow fading and a simple integration was performed based on deploying the mobile at random over the reference cell. When shadow fading was present this approach gave poor results (mean error -0.6 dB and standard deviation 2.1 dB - these ignore some outliers in which the prediction was actually below the level without the mobile).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
EP07121777A 2006-12-05 2007-11-28 Rufzulassungssteuerung Withdrawn EP1931166A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0624286A GB2445393A (en) 2006-12-05 2006-12-05 Call admission control in a cdma communication system

Publications (1)

Publication Number Publication Date
EP1931166A1 true EP1931166A1 (de) 2008-06-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07121777A Withdrawn EP1931166A1 (de) 2006-12-05 2007-11-28 Rufzulassungssteuerung

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EP (1) EP1931166A1 (de)
GB (1) GB2445393A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010104426A1 (en) * 2009-03-09 2010-09-16 Telefonaktiebolaget L M Ericsson (Publ) Method and arrangement for maintaining cell coverage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999045736A1 (en) * 1998-03-06 1999-09-10 Telefonaktiebolaget Lm Ericsson (Publ) Telecommunications inter-exchange measurement transfer
EP1326465A1 (de) * 2002-01-07 2003-07-09 Mitsubishi Electric Information Technology Centre Europe B.V. Verfahren zur Rufzulassungskontrolle in einen Kodemultiplex-Vielfachzugriff-Mobilkommunikationsystem
US20050117533A1 (en) * 2003-11-07 2005-06-02 Interdigital Technology Corporation Wireless communication method and apparatus for implementing call admission control based on common measurements

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1158798C (zh) * 2001-06-27 2004-07-21 华为技术有限公司 一种反向准入控制的方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999045736A1 (en) * 1998-03-06 1999-09-10 Telefonaktiebolaget Lm Ericsson (Publ) Telecommunications inter-exchange measurement transfer
EP1326465A1 (de) * 2002-01-07 2003-07-09 Mitsubishi Electric Information Technology Centre Europe B.V. Verfahren zur Rufzulassungskontrolle in einen Kodemultiplex-Vielfachzugriff-Mobilkommunikationsystem
US20050117533A1 (en) * 2003-11-07 2005-06-02 Interdigital Technology Corporation Wireless communication method and apparatus for implementing call admission control based on common measurements

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010104426A1 (en) * 2009-03-09 2010-09-16 Telefonaktiebolaget L M Ericsson (Publ) Method and arrangement for maintaining cell coverage
US8644871B2 (en) 2009-03-09 2014-02-04 Telefonaktiebolaget L M Ericsson (Publ) Method and arrangement for maintaining cell coverage

Also Published As

Publication number Publication date
GB0624286D0 (en) 2007-01-10
GB2445393A (en) 2008-07-09
GB2445393A8 (en) 2008-07-11

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